/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_14/src/HLTrigger/JetMET/src/HLTRHemisphere.cc

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#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/EventSetup.h"

#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/HLTReco/interface/TriggerFilterObjectWithRefs.h"

#include "DataFormats/Common/interface/Ref.h"

#include "DataFormats/Common/interface/View.h"
#include "DataFormats/JetReco/interface/CaloJet.h"
#include "DataFormats/JetReco/interface/CaloJetCollection.h"

#include "DataFormats/METReco/interface/CaloMET.h"
#include "DataFormats/METReco/interface/CaloMETCollection.h"

#include "DataFormats/MuonReco/interface/Muon.h"
#include "DataFormats/RecoCandidate/interface/RecoChargedCandidate.h"

#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include "TVector3.h"
#include "TLorentzVector.h"

#include "FWCore/ParameterSet/interface/ConfigurationDescriptions.h"
#include "FWCore/ParameterSet/interface/ParameterSetDescription.h"
#include "FWCore/Utilities/interface/InputTag.h"

#include "HLTrigger/JetMET/interface/HLTRHemisphere.h"

#include<vector>

//
// constructors and destructor
//
HLTRHemisphere::HLTRHemisphere(const edm::ParameterSet& iConfig) :
  inputTag_    (iConfig.getParameter<edm::InputTag>("inputTag")),
  muonTag_    (iConfig.getParameter<edm::InputTag>("muonTag")),
  doMuonCorrection_(iConfig.getParameter<bool>         ("doMuonCorrection" )),
  muonEta_     (iConfig.getParameter<double>       ("maxMuonEta" )),
  min_Jet_Pt_  (iConfig.getParameter<double>       ("minJetPt" )),
  max_Eta_     (iConfig.getParameter<double>       ("maxEta" )),
  max_NJ_      (iConfig.getParameter<int>          ("maxNJ" )),
  accNJJets_   (iConfig.getParameter<bool>         ("acceptNJ" ))
{
   LogDebug("") << "Input/minJetPt/maxEta/maxNJ/acceptNJ : "
                << inputTag_.encode() << " "
                << min_Jet_Pt_ << "/"
                << max_Eta_ << "/"
                << max_NJ_ << "/"
                << accNJJets_ << ".";

   //register your products
   produces<std::vector<math::XYZTLorentzVector> >();
}

HLTRHemisphere::~HLTRHemisphere()
{
}

void
HLTRHemisphere::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
  edm::ParameterSetDescription desc;
  desc.add<edm::InputTag>("inputTag",edm::InputTag("hltMCJetCorJetIcone5HF07"));
  desc.add<edm::InputTag>("muonTag",edm::InputTag(""));
  desc.add<bool>("doMuonCorrection",false);
  desc.add<double>("maxMuonEta",2.1);
  desc.add<double>("minJetPt",30.0);
  desc.add<double>("maxEta",3.0);
  desc.add<int>("maxNJ",7);
  desc.add<bool>("acceptNJ",true);
  descriptions.add("hltRHemisphere",desc);
}

//
// member functions
//

// ------------ method called to produce the data  ------------
bool 
HLTRHemisphere::filter(edm::Event& iEvent, const edm::EventSetup& iSetup)
{
   using namespace std;
   using namespace edm;
   using namespace reco;
   using namespace math;
   using namespace trigger;
   
   typedef XYZTLorentzVector LorentzVector;

   // get hold of collection of objects
   //   Handle<CaloJetCollection> jets;
   Handle<View<Jet> > jets;
   iEvent.getByLabel (inputTag_,jets);

   // get hold of the muons, if necessary
   Handle<vector<reco::RecoChargedCandidate> > muons;
   if(doMuonCorrection_) iEvent.getByLabel( muonTag_,muons );

   // The output Collection
   std::auto_ptr<vector<math::XYZTLorentzVector> > Hemispheres(new vector<math::XYZTLorentzVector> );

   // look at all objects, check cuts and add to filter object
   int n(0);
   vector<math::XYZTLorentzVector> JETS;
   for (unsigned int i=0; i<jets->size(); i++) {
     if(std::abs(jets->at(i).eta()) < max_Eta_ && jets->at(i).pt() >= min_Jet_Pt_){
       JETS.push_back(jets->at(i).p4());
       n++;
     }
   }

  if(n>max_NJ_ && max_NJ_!=-1){
    iEvent.put(Hemispheres);
    return accNJJets_; // too many jets, accept for timing
  }

  if(doMuonCorrection_){
    const int nMu = 2;
    int muonIndex[nMu] = { -1, -1 };
    std::vector<reco::RecoChargedCandidate>::const_iterator muonIt;
    int index   = 0;
    int nPassMu = 0;
    for(muonIt = muons->begin(); muonIt!=muons->end(); muonIt++,index++){ 
      if(std::abs(muonIt->eta()) > muonEta_ || muonIt->pt() < min_Jet_Pt_) continue; // skip muons out of eta range or too low pT
      if(nPassMu >= 2){ // if we have already accepted two muons, accept the event
        iEvent.put(Hemispheres); // too many muons, accept for timing      
        return true;
      }
      muonIndex[nPassMu++] = index;    
    }
    //muons as MET
    this->ComputeHemispheres(Hemispheres,JETS);
    //lead muon as jet
    if(nPassMu>0){
      std::vector<math::XYZTLorentzVector> muonJets;
      reco::RecoChargedCandidate leadMu = muons->at(muonIndex[0]);
      muonJets.push_back(leadMu.p4());
      Hemispheres->push_back(leadMu.p4());
      this->ComputeHemispheres(Hemispheres,JETS,&muonJets); // lead muon as jet
      if(nPassMu>1){ // two passing muons
        muonJets.pop_back();
        reco::RecoChargedCandidate secondMu = muons->at(muonIndex[1]);
        muonJets.push_back(secondMu.p4());
        Hemispheres->push_back(secondMu.p4());
        this->ComputeHemispheres(Hemispheres,JETS,&muonJets); // lead muon as v, second muon as jet
        muonJets.push_back(leadMu.p4());
        this->ComputeHemispheres(Hemispheres,JETS,&muonJets); // both muon as jets
      }
    }
  }else{ // do MuonCorrection==false
    if(n<2) return false; // not enough jets and not adding in muons
    this->ComputeHemispheres(Hemispheres,JETS); // don't do the muon isolation, just run once and done
  }
  //Format: 
  // 0 muon: 2 hemispheres (2)
  // 1 muon: 2 hemisheress + leadMuP4 + 2 hemispheres (5)
  // 2 muon: 2 hemispheres + leadMuP4 + 2 hemispheres + 2ndMuP4 + 4 Hemispheres (10)
  iEvent.put(Hemispheres);
  return true;
}

void
HLTRHemisphere::ComputeHemispheres(std::auto_ptr<std::vector<math::XYZTLorentzVector> >& hlist, const std::vector<math::XYZTLorentzVector>& JETS,
                                   std::vector<math::XYZTLorentzVector>* extraJets){
  using namespace math;
  using namespace reco;
  XYZTLorentzVector j1R(0.1, 0., 0., 0.1);
  XYZTLorentzVector j2R(0.1, 0., 0., 0.1);
  int nJets = JETS.size();
  if(extraJets) nJets+=extraJets->size();

  if(nJets<2){ // put empty hemispheres if not enough jets
    hlist->push_back(j1R);
    hlist->push_back(j2R);
    return;
  }
  unsigned int N_comb = pow(2,nJets); // compute the number of combinations of jets possible
  //Make the hemispheres
  double M_minR = 9999999999.0;
  unsigned int j_count;
  for (unsigned int i = 0; i < N_comb; i++) {       
    XYZTLorentzVector j_temp1, j_temp2;
    unsigned int itemp = i;
    j_count = N_comb/2;
    unsigned int count = 0;
    while (j_count > 0) {
      if (itemp/j_count == 1){
        if(count<JETS.size()) j_temp1 += JETS.at(count);
        else j_temp1 +=extraJets->at(count-JETS.size());
      } else {
        if(count<JETS.size()) j_temp2 += JETS.at(count);
        else j_temp2 +=extraJets->at(count-JETS.size());
      }
      itemp -= j_count * (itemp/j_count);
      j_count /= 2;
      count++;
    }
    double M_temp = j_temp1.M2() + j_temp2.M2();
    if (M_temp < M_minR) {
      M_minR = M_temp;
      j1R = j_temp1; 
      j2R = j_temp2; 
    }
  }

  hlist->push_back(j1R);
  hlist->push_back(j2R);
  return;
}

DEFINE_FWK_MODULE(HLTRHemisphere);